Spray head core box blow tube



Nov. 10, 1959 E. F. PETERSON 2,911,691

SPRAY HEAD CORE BOX- BLOW TUBE Fil ed Aug. 29, 1955 2 Sheets-Shem. 1

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L l INVENTOR.

Eda/om FF? ensow Nov. 10, 1959 E. F. PETERSON SPRAY HEAD com: BOX BLOW TUBE 2 Sheets-Sheet 2 Filed Aug. 29, 1955 m m a N 6 P F m w d F m United States Patent 2,911,691 SPRAY HEAD CORE BOX BLOW TUBE Edwin F. Peterson, Neponset, Ill.

Application August 29, 1955, Serial No. 531,042

1 Claim. (CI. 22-10 This invention relates to an improvement in sand conducting core blowing tubes of the character generally employed to convey sand under pressure from a sand supply source into the interior chamber or cavity of a core box.

More specifically this invention is directed to a sand arrester type of blow tube that is constructed and arranged for delivering a multistream pressurized sand discharge throughout a core box cavity and to directionally scatter the sand over a large percentage of the interior surface contour of the core box in filling the latter.

Core boxes are comparatively expensive and proportionally so to the particular intricate nature of each box as judged from its designed purpose. A core box may consist of two or more cooperative matched sections and it may be of the character wherein the core forming cavity is complicated to provide for the production of unique or special core designs. Anything that can be done to lengthen the practical useful life of such a box provides a substantial saving in operating costs in foundry practice and results in better monetary returns due to a more efiicient production average in the process of fabricating cores.

One of the objects of the present invention is to provide a core blowing tube that will not, as in the past, repeatedly discharge a single concentrated pressurized sand stream that will impinge full force against the same opposite wall area of the core box, but to provide a sand blowing tube that will provide a divided discharging sand spray directed into the core box cavity under the same pressurized conditions and sand feed arrangements as heretofore employed.

This distribution of the sand conveyed through one fixed capacity pressurized conduit feed by division into a plurality of finer sand discharge sprays of smaller sand feed quantities under the actuation of a proportional amount of the total fluid pressure for each spray, establishes a better and faster sand filling cycle for a core box and concurrent with this action, the wear action of the abrasive sand material is practically negligible as far as affecting the interior contour of any given area of the core box chamber is concerned.

It is another object, therefore, of the present invention to provide a better and more uniform sand distribution into all corners and contiguous cavity portions of the interior of a core box.

Another object of the invention is to provide an apertured spray head type of blow tube that is connected between a sand supply source and a core box and which is provided with a rounded head that is operatively disposed within a given part of a core box cavity to position the head apertures within the cavity of the core box and to introduce a 180 spray of sand about the axial end of the tube into the core box cavity and through a 360 area about the blow tube axis.

--'As a further object, the blow tube of this invention may be used for granular dry sand discharge or for the discharge of conventional green sand mixes, the tubealso broken away and shown in section to indicate the details 2 featuring a composite construction of metal and rubber, or metal and wear resistant material, with the rubber or wear resistant material forming that portion of the tube that divides the main sand stream of the tube and discharges thedivided sand sprays into the core box interior.

It is an object of this invention to also provide a sand blowing tube that includes the divided spray features of the tube designed, but which tube is designed for directing various sizes of sand streams in predetermined directions within a given cavity configuration of a core box. Under the same conditions the tube is constructed to include orientation means to fix the position of the tube in a given relation to the sand blowing head or blow plate opening so as'to also occupy a given relation to thecore box openings for said tube. Matching orientation means may be carried by the blow head, the core box or by both to coact with the orientation means of the tube thus providing a way to preposition the sand discharge openings of the tube within the core forming cavity of the core box.

Further objects and features of the present design of blow tube reside in the symmetrical contour and shape of the discharge head, the nature of the openings therei and their arrangements.

Other objects and advantages relating to the blow tube of this invention shall hereinafter appear in the following detailed description having reference to the accompanying drawings forming a part of this specification.

In the drawings:

Fig. 1 is a vertical cross sectional view of a separable section core box incorporating a spray head blow tube of the present invention;

Fig. 2 is a fragmentary vertical cross sectional view of a portion of the Fig. 1 construction illustrating a formed core with the blow tube partially withdrawn therefrom;

Fig. 3 is an enlarged vertical axial cross sectional view of a portion of a blow tube constructed according to the principles of the present invention depicting the tube shown in Figs. 1 and 2 and illustrating certain details of construction thereof; L

Fig. 4 is a bottom plan view of the blow tube illustrated in Fig. 3;

Fig. 5 is a fragmentary side elevational view of a modified construction of spray head blow tube partially broken away and illustrated in section to show some of the in- I terior details of the tube;

Fig. 6 is a bottom plan view of the blow tube shown in Fig. 5;

vFig. 7 is a fragmentary side elevational view ofstill another modified construction of blow tube being partially of construction thereof;

Fig. 8 is a bottom plan view of the blow tube illustrated" in Fig. 7;

Fig. 9 is a vertical cross sectional view of a core box 5 supported on a core making machine table and in operative sand receiving position against a sand blowing head,v this arrangement incorporating a sand. blowing tube of Fig. 12 is a fragmentary bottom'plan view ofa portion of the blow head structurep In Fig. 1 a core box isgener'ally illustrated at 1 comprising an upper section 2 and a lower section 3 suit ably joined along a parting line 4' to provide an interior core producing Patented Nov. 10, 1959 -.vity- 5, with the core box being suitably-positioned onthe table6for -":r=rtical movement to wm'dand away fiom theblow'pl'ate 7 of a sand box 8 containing' core sand- 9. At least one of the core box sec tions carries suitable air vents 2a with vent plugs 2b located as shown. 7

- A blow tube 10; is positioned infixedrelati'on ini aligned openings 11' in the blow' plate T and 1-2 inthe upper wall 1'-3 of the upperscction 2 of the core box 1. The head end 14 of the tube projects or depends into the core box cavity and is provided with a plurality of sand! discharging openings 15-through which core and is discharged in streams toform the finished core of the kindwhich is fragmentarily shown at 16 in- Fig. 2; When the twoscctions ofthecore are separated ahemispherical recess 1-7will remain inthe core, this recess being formed by the shape of the projecting head 14 of the-blow tube 11 This cavity 17 may be subsequently patched or it may be located in a core print section as more. fullydescribed in my copending application Serial No. 530,961; filed of even date herewitht.

Referring now more specifically to Figs. 3 and 4', the blow tube compri'sesa metallic conducting section 18' providing ahollow body which is' joined by a bonded flanged arrangement 19 to a resilient or wear resistanthead 20 carrying the openings previously referred to. Asshown in Fig; 4-, the openings 15 are well scattered aboutthe hemispherical headso asto provide a full 180 of sand spr-ay' discharged" into-the-mold when considered in a plane axially disposed with respect tothe tube position and a- 360 sand spray in a radialdirection about the tube end in the core cavity;

The hemispherical head 20 isconstructed from rubber or-fronr other tough but resilient wearresistant material so that this tip, which transforms the main sand stream under pressure being conducted through tube section 18, is readily adapted to sustain the wear of the abrasive material andtoseparate this sand: stream into aplurality of finer streams that are discharged through theopenings 15 in the head 20; Each of the individual sand streams carry their ownproportionate share of thetotal fluid pressure confined and directed through tube 18' so that" the entire pressure arrangement and discharging abrasive material is widely distributed throughout the interior cavity of the core box 1 to substantially re-' duce wear of the interior walls of the core box toa minimum and negligible value.

The tube shown in Figs; 5- and 6 is-proportioned' as-a bullet head 21 with the head comprising a resilient'wear resistant material or a materialthat will counteract wear by'the abrasive material; In this-particular form of the invention a plurality of slits 22 such as shown in Fig. 6 are provided radially with respect tothe axis of the tube and extend from a central closed end portion of the tube tip thereof upwardly and outwardly to substantially the full diameter of the tube structure. In this form, the individual segmental parts 23' consist of a plurality of bands that will all bulge open outwardly under action of the internal fluid pressure to open the slits 22 to" provide a discharge about'the bottom of the tube end as indicated by the dot and dashlines 24 in Fig. 5. Atthe same time the discharge will also be 360 radially of the tube axis causing, in efiect, a sand cloudunder pressure that fills the core box. 1

In. the, form of the invention illustrated in Figs. 7 and 8 the blow tube, is. provided. with a. truncated cone end.25.- that. ismade of wear resistant orresilient material as in the: forms, shown in Figs. 3 and 5. In the latter constructionthe head 25 is provided with a plurality of slits 26, 27, 28 and 29- establishing a plurality. of. segmental parts. such-as30, 31, and 32 which aregall adapted to open outwardly-unders internal fluid. pressure: supplied to. thetube; structureto .-discharge. the tube sand intotthe core box-.cavity; I

a Itshould, begnoted'thatthe slits; 26 are of a". predeter-i mined lengthrandequally spaced about the'upperhalf.

portiongottthe tube: as itappear-s ir; Fig. 8, Slits 28 and i 29 are also of equal length but are shorter than slits 26 andare staggered vertically, while the slit 27 may be of a difierent length. At the same time the angularity between slits 26 is different from the angularity between the other group of slits 27 to 29 all of which provides a predetermined pattern of sand distribution for the particular accommodation of a given internal configuration of core box.

Thus, the various forms of spray head core box tubes are all devised for sandspray distribution outwardly of the tube tips and substantially about the 180. of the end of each of the tube heads and also in an area considered 360 radially of such heads with all of the sand discharge points being locatedwithinthe cavity of the core box per se. The impression 17 left in the formed core 16 as shown in Fig. 2 may easily be patched after the core is formed or else the tube locations may be so chosen as to coincide with a core print area as previously mentioned.

With a. predetermined positioning of the tube and'with' a predetermined" chosen design of openings or slits, such a tube or tubes may be well adapted to a particular irregular shape of core box and to function efiiciently and quickly to fill such a box with core sand with certain areasofthe tube discharging greater quantities of sand inone direction while other portions of the tube will discharge difierent quantities of sand in stillother directions within the core box.

The blow tubes are therefore well adapted to provide the most eflicient arrangement for filling a core box quickly, adequately and with substantially insignificant wear considered-in the light ofthe normal life of a core box as determined by other factors of damage and wear during use. Graphically; Figs. 9- to 12 illustrate theprincipleas applied' to a tube having placed sand discharge openings of certain sizes all adapted for use in blowing cores in the core box 33-shown.

The core box 33- comprises upper and lower' sections 3'4 and 35 alignedbypins 36 at the parting line 37 with cavity portions such as 38-, 39 and 40 providing the contiguous core forming chambers. Section 34 has vents 41 and 42 with vent plugs 43 in vents 42. The upper end of section 34' is flanged at 44' for connection with the blow plate 45 of the blow head- 46 carrying core sand 47, while the section 35 is flanged at 48 for lug means 49that secure section 35' to the vertically movable table 50 of the core making machine.

A blow tube 51- of the present inventive design is fitted into an opening 52in. blow plate 45 and depends through opening 53 in core boxsection 34 into the cavity 38. Tube 51 has a head 54' provided with two smaller sand discharge openings 55 at certain peripheral positions on the truncated wall' 56 of the head and a larger sand discharge opening 57 oppositely arranged on another portion of the truncatedwall56.

With this arrangement of'openings and their locations on the head of the blow tube 51 .and on the tapered wall ofthe head as. shown, sand streams 58;and 59 match the directions of the long hollow configurations of the core box and with the force of the sand streams and quantity of lessened sand discharge, wear by impingement is substantially. eliminated While filling of the. core box is more efliciently provided in reduced time cycles.

In. the. construction; and arrangement described itis necessary to orient the tube with respect to the core box to arrive at the results indicated. For this purpose the tube may be marked 4x to go with box 33 also so marked. as shown in Figs. 9and 11 respectively. Then the tube 51 is. scribedor otherwise marked to show a line. 60. adapted. for. alignment. with either. a reference marlcor. line. 61 on. the. co'reboxv 33 or 62 ontheblow plate 45 or the tube cantbe aligned with. bothiithat;

isdesirable. Fundamentally, the orientationmeans is provided to obtain-theproper position'of: the tube to. tativelyupon. its. axis to. preposition the sand charge:

openings in the head in given relation to the core box 33 as best determined by the extent and locations of the interior cavities of the core forming box.

The foregoing disclosure and description has been directed to preferred forms of the invention and it is contemplated that certain changes may be made in the individual elements or in the combination of elements of such tubes without departing from the fundamental concept of the invention. Such modifications, however, shall be restricted in breadth and scope according to the language set forth and defined in the following appended claimed subject matter.

What I claim is:

In combination with a core box having walls to outline and to define an internal core forming cavity with an upper wall of the core box containing an access aperture extending therethrough and into an intermediate portion of said internal core forming cavity, a sand conducting tube having a rubber tip extending through said upper Wall aperture of said core box and depending freely in said core forming cavity in freely suspended relation therein, said tip having a portion lying within said aperture, a closed end lying within said cavity, and a portion lying within said cavity having an outer wall converging towards said closed end and containing a plurality of radially disposed discharge slits unequally spaced from said end and peripherally about said tip to directly communicate with said cavity from a point within said cavity to direct sand in a plurality of directions having both radial and axial components from said discharge opening into said cavity, whereby the introduction of sand under pressure through said tube tends to produce a seal between said core box and tip.

References Cited in the tile of this patent UNTTED STATES PATENTS Re. 16,539 Hamm Feb. 1, 1927 201,689 Leermo Mar. 26, 1878 1,034,334 Bannister July 30, 1912 1,056,811 McElroy Mar. 25, 1913 1,096,585 YoSt et al. May 12, 1914 1,280,062 Mertz Sept. 24, 1918 1,636,314 Murray July 19, 1927 1,695,855 Moore et al. Dec. 18, 1928 1,971,376 Hunt et al Aug. 28, 1934 2,107,814 Billand Feb. 8, 1938 2,392,085 Ferrel Jan. 1, 1946 2,457,756 Vest Dec. 28, 1948 2,468,672 Judell Apr. 26, 1949 2,484,943 Guise et al. Oct. 18, 1949 2,512,871 Ostermann et al. June 27, 1950 2,556,618 Harrison et al. June 12, 1951 2,607,968 Peterson Aug. 26, 1952 2,636,230 Morton Apr. 28, 1953 2,647,014 Edwards July 28, 1953 2,661,513 Brewer Dec. 8, 1953 2,687,559 Peterson Aug. 31, 1954 2,688,780 Anderson Sept. 14, 1954 Daniel et a1. Aug. 7, 1956 

